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04-24-2013, 11:11 PM | #21 |
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Join Date: Jul 2011
Location: San Andreas CA.
Posts: 78
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Re: backfiring and not much power
Also make sure your battery is hooked up pos ground. It will run neg ground, just not very well.
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04-25-2013, 01:54 AM | #22 |
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Join Date: May 2010
Location: Bucks County, PA
Posts: 11,454
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Re: backfiring and not much power
you need to go over this car properly,start with the basics and reset/ clean and or replace the points/condenser and reset the timing to proper specs. possibly also go through the carb by cleaning it out or getting one from berts which are reasonable "the guys have had good reports of them".
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04-25-2013, 06:50 AM | #23 |
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Join Date: Oct 2011
Location: Falmouth, Ma.
Posts: 313
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Re: backfiring and not much power
Morning people, my story goes like this. After having to flat bed my Coupe back to my garage, maybe a half doz. Times, and I was close to scrapping her, I called this old guy wok has worked on A's for 70 + years. After many trials and tests, we found a small piece of metal under the upper plate in the distributor lol. Problem solved no more back firing or loss of power.
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04-25-2013, 06:59 AM | #24 | |
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Join Date: May 2010
Location: Bucks County, PA
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Re: backfiring and not much power
Quote:
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04-25-2013, 07:34 AM | #25 |
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Join Date: May 2010
Location: Bethany, Ok
Posts: 382
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Re: backfiring and not much power
We say it all the time here don't think any one said in this post. Find and join your local model A club. There is a good one in your area, they will be eager to help you. They have a wealth of knowledge.
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04-25-2013, 03:28 PM | #26 |
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Join Date: Oct 2012
Location: Whangarei, New Zealand
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Re: backfiring and not much power
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DOes anyone know what the octane rating of the gaslone would have been in the 20's/30's???I've read 60-80, but have nothing solid. I'm expecting it was a lot lower than it is now (Many old cars specify FAR lower required ratings than any modern fuel has, I've seen 50's cars that required 72 octane and similar), so if you still have stock compression, the lever can probably be pulled further down without problems, couldn't it? It would be far less prone to pre-ignition. Once cruising on any flat road (45 MPH or so) I run it between full advance and a couple of clicks up. I move it closer to half on steep or long hills. I know I don't want to run it too retarded either, because the exhaust gas temperature skyrockets and you start risking over heating, or cracked heads and saggy exhaust manifolds. I wonder if Henry's advice in the book still applies less with more modern fuels and higher octane ratings?
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Allan '29 Tudor, Canadian RHD Whangarei, NZ "Duct Tape can't fix stupid, but it can MUFFLE the sound" |
04-25-2013, 06:30 PM | #27 |
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Join Date: May 2010
Location: Savannah, GA
Posts: 1,300
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Re: backfiring and not much power
Check joint between carb and manifold, and if you have an air leak in carb.
I had a bad gasket and a warped Tilly top half. Very lean, no power, lots of GAV. Lean test is to gently downshift while coasting downhill. Popping=LEAN.
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04-25-2013, 10:07 PM | #28 | |
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Join Date: May 2010
Location: Windy City
Posts: 2,919
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Re: backfiring and not much power
Quote:
With today's worst gas at 87 octane full advance at 4.22CR may not produce any spark knock, but will certainly present too much cylinder load while still on the upstroke. Not readily detectable by ear, you now need a very good 'feel' for how the engine behaves. Not everyone has that fine touch. The learning curve is steeper today than back when. |
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04-26-2013, 06:53 AM | #29 | |
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Join Date: May 2010
Location: Savannah, GA
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Re: backfiring and not much power
Quote:
Recently, I've found the car runs better on the street at 8:30 to 9:00 rather than 7:30.
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20 years ago we had Johnny Cash, Steve Jobs, and Bob Hope. Now we have no Cash, no Jobs, and no Hope...please don't let Kevin Bacon die! |
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04-26-2013, 06:57 AM | #30 |
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Join Date: May 2010
Location: Largo Florida
Posts: 7,225
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Re: backfiring and not much power
Yep, what Mike just said. It takes a little practice and some feel. But, playing with the spark lever will produce a noticeable difference in what the engine likes and dislikes without ever hearing detonation/spark knock.
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04-26-2013, 07:49 AM | #31 |
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Join Date: May 2010
Location: Rhode Island
Posts: 1,868
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Re: backfiring and not much power
Your best advice is to find someone in the San Antonio area that can look at your car for you. I'm sure there is a local Model A club that you could attend a meeting. Your condition could be caused by a variety of maybe or not so maybe obvious causes. Not knowing the history of your car you should at least start with a compression test of the engine, check fuel flow and the ignition system.
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